main.py

from llama_index.core import SimpleDirectoryReader, get_response_synthesizer
from llama_index.core import DocumentSummaryIndex
from llama_index.llms.openai import OpenAI
from llama_index.core import load_index_from_storage
from llama_index.core import StorageContext, ServiceContext
from llama_index.core.tools import QueryEngineTool, ToolMetadata
from llama_index.vector_stores.faiss import FaissVectorStore
from llama_index.core.query_engine import SubQuestionQueryEngine
from llama_index.agent.openai import OpenAIAgent
import openai
import faiss
import os

import nest_asyncio
nest_asyncio.apply()

# os.environ["OPENAI_API_KEY"] = "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"

vector_store = FaissVectorStore.from_persist_dir("./storage")
storage_context = StorageContext.from_defaults(vector_store=vector_store,persist_dir="./storage")
index = load_index_from_storage(storage_context)
individual_query_engine_tools = [
    QueryEngineTool(
        query_engine=index.as_query_engine(),
        metadata=ToolMetadata(
            name=f"timetable",
            description=f"useful for when you want to answer queries",
        ),
    )
]

query_engine = SubQuestionQueryEngine.from_defaults(
    query_engine_tools=individual_query_engine_tools,
    llm=OpenAI(model="gpt-3.5-turbo"),
)

query_engine_tool = QueryEngineTool(
    query_engine=query_engine,
    metadata=ToolMetadata(
        name="sub_question_query_engine",
        description="useful for when you want to answer queries",
    ),
)

tools = individual_query_engine_tools + [query_engine_tool]

agent = OpenAIAgent.from_tools(tools)

# while True:
#     text_input = input("User: ")
#     if text_input == "exit":
#         break
#     response = agent.chat(text_input)
#     print(f"Agent: {response}")